GFS2: Move i_size from gfs2_dinode_host and rename it to i_disksize

This patch moved the i_size field from the gfs2_dinode_host and
following the ext3 convention renames it i_disksize.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index c3ba3d9..f5cef2a 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -206,14 +206,14 @@
 	int ar;
 	int error;
 
-	if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
-	    (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
+	if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
+	    (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
 		gfs2_consist_inode(ip);
 		return -EIO;
 	}
-	jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
+	jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
 
-	error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
+	error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
 	if (!error && ar) {
 		gfs2_consist_inode(ip);
 		error = -EIO;